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Foundational to this approach is the need to cross from the Unreal C++ boundary into the C# DLL code. This boundary is inherently risky as it lacks much of the standard safety checks we normally rely on in managed code.
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Now, OsmAnd performs another Dijkstra search, but this time on the much smaller "base graph." This graph consists only of the border points and the pre-calculated shortcut values between them.
The bulk of this is thought to have been accrued by five key departments – the Cabinet Office, Home Office, Department of Health and Social Care, Treasury and UK Health Security Agency, which have been repeatedly asked to provide evidence.